Can I use a Japanese PSN card on my American account, I want to buy the Namco Arcade so I can get the home items (I do have a Japanese account and a Hong Kong account).
Japanese and/or Hong Kong Playstation tickets will only work on their perspective PSN Stores.
Ok, now where can I buy a Japanese PSN card and will the Namco Arcade Home items on the America Home
As far as the Namco Museum game (Full version from JPN store), it will not transfer anything over to your NA account. You need to get the Namco Museum Beta (it's free) from the HK store. It will be the free game with a large red n as the picture. You can get the Beta from the JPN store as well, but you will not be able to play the unlocked game cabinets in your Home space (only the HK version allows this).